Search results for "Preferential attachment"
showing 6 items of 6 documents
The Dynamic of Innovation Networks: A Switching Model on Technological Change
2012
In this paper we introduce an agent-based model with heterogeneous firms which compare their mutual innovation strategies on different network structures. By implementing a dynamic behavioral switching via a fitness mechanism based on agents performance, companies can endogenously modify their tactics of technological change and switch among three groups: stand-alone innovators, collaborative innovators and imitators. We focus the analysis on the impact of these three innovation categories on micro, meso and macro aggregates. Our findings show that collaborative companies are those having the highest positive impact on the economic system. Moreover, we study the properties of the emerging n…
Towards realistic artificial benchmark for community detection algorithms evaluation
2013
Many algorithms have been proposed for revealing the community structure in complex networks. Tests under a wide range of realistic conditions must be performed in order to select the most appropriate for a particular application. Artificially generated networks are often used for this purpose. The most realistic generative method to date has been proposed by Lancichinetti, Fortunato and Radicchi (LFR). However, it does not produce networks with some typical features of real-world networks. To overcome this drawback, we investigate two alternative modifications of this algorithm. Experimental results show that in both cases, centralisation and degree correlation values of generated networks…
Guanxi, performance and innovation in entrepreneurial service projects
2013
PurposeThis paper aims to analyze the role played by two dimensions of entrepreneurs' private social capital in the survival, growth and innovativeness of entrepreneurial service ventures: local size and preferential attachment degree.Design/methodology/approachData were collected by a questionnaire, the unit of investigation being the private entrepreneur in the service sector in the city of Shanghai. The questionnaire allows the authors to identify the social network of the entrepreneurs, estimate the empirical degree distribution for the entire sample, and estimate local size and preferential attachment degree.FindingsThere is empirical evidence that entrepreneurs do not create social ne…
Transience versus recurrence for scale-free spatial networks
2020
Weight-dependent random connection graphs are a class of local network models that combine scale-free degree distribution, small-world properties and clustering. In this paper we discuss recurrence or transience of these graphs, features that are relevant for the performance of search and information diffusion algorithms on the network.
Le développement des médias sociaux. Proposition d'un modèle de diffusion intégrant les externalités de réseau dans un cadre concurrentiel
2011
International audience; La fréquentation des médias sociaux est très concentrée. L’intérêt de ce type de sites résidant dans la richesse du contenu élaboré par les participants, ce phénomène peut être en partie expliqué par les externalités de réseau. Afin de démontrer cet effet dans un cadre concurrentiel, cette recherche propose un modèle de diffusion intégrant le principe de l’attachement préférentiel issu des recherches en réseaux complexes. Ce modèle est analysé au travers d’une simulation et appliqué à 51 médias sociaux dans trois secteurs différents. Les résultats montrent que l’ajout de l’effet d’attraction menée par la taille relative du réseau social explique mieux la diffusion qu…
Theoretical morphology of tetrapod skull networks
2014
Abstract Network models of the tetrapod skull in which nodes represent bones and links represent sutures have recently offered new insights into the structural constraints underlying the evolutionary reduction of bone number in the tetrapod skull, known as Williston's Law. Here, we have built null network model-derived generative morphospaces of the tetrapod skull using random, preferential attachment, and geometric proximity growth rules. Our results indicate that geometric proximity is the best null model to explain the disparity of skull structures under two structural constraints: bilateral symmetry and presence of unpaired bones. The analysis of the temporal occupation of this morphosp…